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Home  > Raw materials & technologies  > Applications  > Protective & Marine coatings  > Self-repairing oxides to protect zinc

Saturday, 21 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Self-repairing oxides to protect zinc

Monday, 17 June 2013

This study reviews existing literature to identify strategies for building self-repairing oxides on zinc in the future. The authors focus on building self-repairing oxides for the short-term protection of zinc and also suggest criteria for selecting inhibitor systems.

Study discusses self-reparing oxides to protect zinc / Source: Sergey Eshmetov, Fotolia

Study discusses self-reparing oxides to protect zinc / Source: Sergey Eshmetov, Fotolia

This review by Australian researchers looks to narrow down the problem and find some key aspects which will require research to make the development of self-repairing oxides possible.

According to the authors, zinc is protected in the short term by chromate conversion coatings. The Cr (VI) based surface layer has the unique ability to self-repair which is attributable to the aqueous properties of its constituent ions. The thermodynamic feasibility of achieving chromium-like protection for the short term using other candidates is also reviewed.

Long-term protection of zinc is naturally affected by its own corrosion products (patina), which form a multilayered structure. The role of this patina in protecting the underlying metal is also reviewed, and processes within the patina, including the interaction between its various layers, are elaborated and discussed.

Read the complete study "Self-repairing oxides to protect zinc: Review, discussion and prospects” in Corrosion Science, vol.69, 2013, pp. 11-22.

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